COPRINUS LAGOPUS 



325 



project from the sides of the gills as pegs. If one examines with 

 the microscope the under side of such a pileus as that shown at B 



Fig. 146. — Coprinus lagopus. Semi-diagrammatic transverse section through the 

 stipe, and longitudinal transverse section through the gills, of a fruit-body 

 of wliich tlie pileus has become flattened owing to expansion. To show that 

 the cystidia in an expanded pileus no longer cross the interlamellar spaces but 

 merely project from the gill-sides like pegs. Spore-discharge is not visible, 

 as it is taking place from the edges of the gills below the plane of section. An 

 optical section like that here shown can be seen when an expanded pilevis is 

 turned upside down on a slide and viewed with the low power of the microscope. 

 s, the stipe ; g, g, gills ; h, h, the dark layer made up of the protuberant parts of 

 the long basidia and the black spores of the long and short basidia ; i, i, inter- 

 lamellar spaces ; c, c, cystidia. Magnification, 29. 



in Fig. 147, one finds that it has the appearance represented in 

 Fig. 146. 



In a young and unexpanded fruit-body, such as that shown in 

 Fig. 138, M (p. 316), the edges of the gills are in contact with the 

 stipe ; and they are also united with one another by means of large 

 cells which somewhat resemble the cystidia (pleurocystidia) on the 

 gill-sides and which may be regarded as cheilocystidia. This union 



